Kanye to Mencia -- I Ain't No Cosby!

Kanye West did not like being called "Theo Huxtable" one bit, and he's spitting back at Carlos Mencia -- the guy who slapped him with that ignominious label.

Mencia did a hilarious spoof of West's smash "Gold Digger" on his Comedy Central show, skewering West for downplaying his suburban, upper-middle-class background -- his mother was an English professor and father a well-paid photographer.

And now, Kanye's response: On his latest single, "Can't Tell Me Nothing," he disavows any connection to the Huxtables, rapping, "I ain't one of the Cosbys, I ain't go to Hillman," referring to the college one of the Huxtable children attended in the series.